Internal combustion engine of the two-cycle type



Oct. 20, 1942. H. F. HELLMAN INTERNAL COMBUSTION ENGINE OF THE TWO CYCLE TYPE Filed May 22, 1941 Patented Oct. 20, 1942 UNITED STA'E'g FFATEN'E' OFFICE INTERNAL COMBUSTION ENGINE OF THE TWO-CYCLE TYPE Henry F. Hellman, Cleveland, Ohio Application May 22, 1941, Serial No. 394,581

1 Claim.

This invention relates to that type of internal combustion engines or motors in which the fuelinduction charge to and release from the compression chamber bounded by the closed end of the fixed cylinder member arranged in the cylinder block, the wall of the hollow piston and the under side of the piston head is controlled by ports in the piston wall registering with ports in the cylinder block wall when the piston reciprocated therein.

In order that this invention may be more clearly understood and readily carried into eifect, I will proceed to describe the same with reference to the accompanying drawing which illustrates an embodiment of thi invention, and in which:

Figure 1 is a view in axial sectional elevation of the improved engine, showing the fuel-induction port uncovered.

Figure 2 is a fragmentary View in axial sectional elevation, illustrating the relationship of the fuel releasing port in the piston with the bypass channel, or transfer passage, which communicates with the combustion chamber of the cylinder block, whereby the fuel charge is transferred from the compression chamber to the combustion chamber.

Referring to the drawing in detail, wherein similar reference characters designate corresponding parts throughout th views, I designates the cylinder block of a two-cycle engine, II the crank-case thereof, 12 the crank shaft, I3 the piston and I 4 the connecting rod.

In the wall of the cylinder block there is provided a fuel-induction or intake port i5 to which fuel may be delivered from a suitable source (not shown) and an exhaust port thereabove shown at l6. However, a plurality of intake and exhaust ports may be provided if desired. In the cylinder block wall there is also provided a charge egress l7 and ingress l3. The egress and ingress are connected by means of a by-pass I9 that forms a transfer passage or channel 20 for the fuel charge from the compression chamber 2| into the combustion chamber 22 of the cylinder block.

In the piston wall there is provided a fuel intake port 23 and a fuel releasing port 24. Obviously the piston wall may be provided with a plurality of fuel intake ports if desired. The piston is of the deflector-head type as shown at 25.

At th top of the piston stroke the intake or fuel-induction port 15 is opened by registering of the port 23 therewith in the piston wall, thereby permitting the fuel to enter the compression chamber 2!, while the exhaust port [6 thereabove is closed. At the bottom of the piston stroke the exhaust port I6 is open, while the intake port I5 is closed, While at the same time the fuel outlet 24 in the piston registers with the egress I! thereby permitting the fuel charge in the compression chamber 2| to be transferred through the transfer passage 20 formed by the by-pass 19 to the ingress I 8 to the combustion chamber 22 in the cylinder block thereby driving the spent gases from the combustion chamber through the open exhaust port It previous to the next explosion.

In the cylinder block there is provided a fixed cylinder member 26, having a closed end 21. This cylinder is provided with diametrically aligned slots, one of which is shown at 28 in Figure 2. The slots permit the travel of the wrist-pin 29 which extends diametrically across the fixed cylinder and into the piston wall and are of a width to frictionally receive the-Wristpin. The ports in the piston are definitely aligned with, and are brought into absolute register with the ports in the cylinder block through the positive travel of the piston therein. The fixed cylinder prevents the piston from canting on the wrist-pin when the firing of the charge takes place.

Lubricating holes are shown at 30 which communicate at their lower ends 3| with the crankcase, while their upper ends 32 lead into the annular space 33 which surrounds the fixed cylinder member. Rings 34, 35, 36 and 31 are provided in the piston and the fixed cylinder member and bear against the interior wall of the cylinder block and the interior wall of the piston to provide gas-tight sliding contact. Th spark plug is shown at 38.

The cylinder block may be provided with a water jacket, or air cooling fins if desired.

Summarizing, briefly, the operation of the engine, it operates on the two-cycle principle, namely, suction, compression, explosion and exhaust in two strokes or cycles, well understood in the art.

It will be understood that the above description and accompanying drawing comprehends may be made within the scope Of the appended claim Without sacrificing any of the advantages of my invention.

Having thus described my invention, what I claim is:

In an explosion engine the combination of a arranged in working fit with the inner wall of flanged cylinder block having intake and exhaust the reciprocating piston and forming a gas tight ports therein, a reciprocating piston of the desliding contact with the inner wall of the recipflector-head type having ports cooperating thererocating piston, and further being supplied with with to control communication with the cylinder lubricating holes affording communication beblock, a crank case, a flanged fixed cylindrical tween the annular space which surrounds the member having a closed upper end, the flange of fixed cylinder member on the up stroke of the rethe fixed cylindrical member being mounted on ciprocating piston and whereby lubrication of the the crank case and interposed between the flange inner wall of the cylinder block and the outer on the cylinder block and the crank case and 1 wall of the fixed cylinder member is facilitated fixed against longitudinal movement thereby, the by the reciprocation of the piston.

outer wall of the fixed cylindrical member being HENRY F. HELLMAN. 

